Injector



(No Mode1.)f 2 sheets-sheen 1.

. W. R. PARK.

INJBGTOB.- N0. 297,836. Patented Apr. Z9, 1884.`

L -s: ik

Witness es: Iwenor:

(No Model.) 2 Sheets-Sheet 2.

W. R. PARK.

INJBOTOR. No. 297,886. PafcewfltedAprl 29, 1884.

Witnesses Inventor:

y f@nrcan STATES PATENT @Erica WILLIAM n. PARK, or TAUNTCN, MASSACHUSETTS, Assrenon ToTHn HAN- CocK INSPIRATOR COMPANY, or MASSACHUSETTS.

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SPECIFICATION forming part of Letters Pate'nt No. 297,836, dated April' 29, 1884.

Application filed Novembn' 3, 1883. (No model.) i

To LZZ r11/wm it may concern:

Be it known that I, WVM. It. PARK, of Taunton, in the county of Bristol, and in the State of Massachusetts, have invented certain new and useful Improvements in Injectors, andI do hereby declare that the following is a full, clear, and exact description thereof, reference being had tothe accompanying drawings, in which- Y Figure l shows a view in side elevation of an injector of the single-action form, with my invention applied thereto; Fig. 2, a vertical central section of the same; Fig. 3, a view in side elevation of an injector of the double-act-y ing form, with my invention applied to it and Fig. 4, a central vertical section of the same.

The object of my invention is to provide means for automatically,preventing or relieving a vacuum in the steam-chambers or steampipes of injectors; and to this end it consists in the valve constructed, arranged, and operating as hereinafter described, and more speciiically pointed out in the claims.

In the drawings, A in Figs. 1 and 2 designates the casing of a single-action injector of an ordinary and well-known form. C designates the steam-chamber; D, the steam-admitting valve; VE, the steam-nozzle; F, the combining-tube; F, the water-chamber; F, the water-supply pipe; G, the checlcvalve, andH ,y the overloW-valve. From the side of the steam-chamber C extends the passage I in arm K, projecting from the casing of the steam-chamber, as shown. At the end of this arm is an enlargement, L, which is provided with the vertical passage M, intersecting the end of passage I, and preferably made larger indiameter than the latter. At the upper end of that portion of passage M which eX- tends downward from passage I is formed a seat, N, for the puppet-valve O. rIhe rest of the passage M above this valve-seat is, as shown, made large enongh to admit the removal and insertionV of the valve in place.. A screw-plug, I), closes the upper end of the passage, and is formed with a central cylindrical recess, p, opening downward. The valve-guiding stem fits and reciprocates below in the lower portion of the passage M, and

5C above in the recess in the screw-plug l?, de-

scribed above. This valve-stem is formed of four plates radiating from the axis ofthe stem;

but I do not wish to limit myself to such construction or number of radiating plates. As the object of so constructing the valve-stem lis tovprevent said stem from closing entirely the recess or passage in which it is guided, a cylindrical stem having a number of longitudinal grooves along its surface vcould obviously be used instead of the form shown, or a cylindrical stem with a central longitudinal passage connected with' radial openings or passages opening close above and below the Valve proper. v Y l The overiioW-valve II, which is of a form capable of adjustment to bring its escape-pipe into any desired position, I prefer to place, asy

shown, at or beyond the end of the combiningtube F. As I do not claim this overflowvalve, or the construction or arrangement of any of the parts-of the injector proper, it is` not necessary for me to describe such injector or overflow-valve further herein.

In Figs. 3 and 4. I show my vacuum relieving and preventing device as applied to one form of a Hancock inspirator. In.` this form the valve-passage I opens into the `steamchamber O, which communicates with the two steam-nozzles, E E. As the rest of the injector isof a common and well-known Vconstruction, it is not necessary to describe its construction further. My vacuum preventing device is especially applicable to any non-lifty ing injector, whether the overfiow be arranged at some distance from said instrument. When the injector is out' of action, the water is shut off by a lazy-cock or suitable valve in the water-supply pipe, and the steam-valve is closed.

IOO

It generally happens that the steam-valve does not shut perfectly tight, so that a little steam can leak by it. The pipe between the valve and the steam-chamber, as well as the chamber itself, then becomes filled with steam of a very low tension. Vhen the injector is to be started again, the overflow-valve II is opened to allow a temporary outlet to the atmosphere. XVater is then admitted through the supplypipe and flows into the water-chamber up over the top ofthe combining tube or tubes, through such tube or tubes, and out at the overflow. This water eondenses the low-tension steam in the steam chamber and pipe, and causes a partial vacuum therein. rIhen, when the overflow-valve H is opened, (whether this overflow be located as shown or at an interval between the combining and delivery tubes,) air will rush in to relieve this vacuum, and in passing through the combining tube or tubes will prevent or impede the flow of water in the opposite direction through the tubes to the atmosphere, so that the tube or tubes will not be iilled with water ready to be injected when the actuatingsteam is admitted. It has therefore been necessary, when such failure to operate occurred, on account of influx of air at lthe overflow caused by the vacuum, to shut off the water and stealn and begin again. Vith my relief-valve, constructed and applied as described and shown, as soon as a vacuum begins to form in the steam chamber or pipe the outside air lifts the valve and rushes in to relieve such vacuum, so that the flow of water to the overfiow-valvc is not interfered with, and the injector is ready to be started in action with certainty at any time.

The vacuum-relief valve can be applied, as shown, to a passage from the steam-chamber, or to the steam-chamber itself7 or to the steampipe entering the steam-chamber.

Having thus fully set forth the nature of my invention, what I claim is l. In combination with an injector, a vaca uni-relief valve applied between the steamvalve and the discharge end of the steam-nozzle, and adapted to be opened by the pressure of the atmosphere when the pressure within the steam pipe or chamber falls below that of the air without, substantially as and for the purpose described.

2. In combination with an injector, an automatic valve adapted to remain normally closed against the egress of air or steam from the steam chamber or pipe, and to be opened by the pressure of the atmosphere to admit air from without into said chamber or pipe when a vacuum occurs therein, substantially as and for the purpose set forth.

3. In combination with the injector and the passage opening into the steam chamber or pipe between the steam valve and nozzle, the automatic valve situated in such passage, and adapted to normally close it against pressure from within, and to be opened by the pressure of the air without, to admit air to the chamber or pipe when a vacuum occurs therein, substantially as and for the purpose set forth.

4. In combination with the passage extending from the steam chamber and the passage intersecting the outer end of said passage, and closed at its upper end with a suitable recessed plug or cap, the puppet valve closing the opening into the lower end of the intersecting passage, and having its stem fitting in and guided by said lower end of the passage and the recess in the plug or cap, but so formed as not to close them, substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 19th day of October, A. D. 1883.

TVM. R. PARK.

Witnesses:

WALTER L. CHENEY, ELMER P. HowE. 

